Other Specifications and Features of the Side Charging AR-9 Stripped Billet Upper with LRBHO:

Machined from 6061 billet aluminum

Matte black hard-coat anodized per Mil 8625 Type 3 Class 2

Compatible with all Glock Mag AR-9 components and most aftermarket parts

Adjustable tension slide lock on charging handle

Rear dust cover trap door that seals shut when mated with lower

Manufactured to MILSPEC on state of the art CNC equipment for consistent quality parts and exacting tolerances

Save money by building your own AR pistol caliber rifle from the ground up exactly the way you want it configured

**NOTE: Some rail systems that use anti rotation tabs may need slight modification to fit this upper. It is designed for flush mounting rails and standard handguards.

**When using this upper for a 9mm or .40 build you must either use a carbine buffer with our buffer spacer, or a 9mm LONG buffer. Not following these instructions could cause damage to the rear door of the upper that will NOT be covered under warranty**